Tubing



Apr 1 1924210 EASSE H. w. EUNDY TUBING Filed March '7. 1921 i 2 Sheets-Sheet 1 I ATTORNEY.

April 1 1924. 1,488,585

H. W. BUNDY TUBING Filed March` '7. 1921 2 Sheets-Sheet 2 INVENTOR. nyK/qy Y B A TT ORNE Y.

y bf tubing, and has for its object a 'form et Fatented Apr.' 1, ii] N i Ei mener ur. sunny, .er nn'rnoir, manteau'.

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.r o all whom t may concern: i

Be it known that I, Hauer W. Burana, a citizen of the Unitedv States, residino at Detroit, in the county ot Wayne and tate of Michigan, have invented certain new and useful Improvements in Tubing, oit' which the following is a specification.

This invention relates to tubing and' rings open seam tubing whichl can be manufactured very economically and which may have a variety of uses. This tubing may be manufactured in coils and may be cut up in sections to 'form rings when the ends are welded together, as will more fully appear.

ln the dravvings, .Fi s. 1, 2, 3, 4 and 5 are views of the rolls showing half a coil of thestock in connection with each set of rolls as the Work roceeds from the first operation tov the nal operation.

Fi 6 `is an -,elevation showing a complete ring of the tubing.

Fig. 7 is anend elevation ofone set of rolls showing the guide which causes the stock to coil. i

Fi 1 illustrates a a plain strip of meta i by giving it an obtuse angle at the center and also by turning up the' edges slightly. lin the next .operation shown-in Fig. 2 the rolls bend the tube up the sides of the tube more and also curl in the edges slightly. ln

the third operation shown in Fig. 3 the rolls bend u the side walls still more and curl in the rol ed-over edge portions even more. n

i the-next to the last o 'eration shown in Fig. 4 the side walls of l e tube are bent into substantially U shape and the turned-over pas of fous by which edges are folded over more sharply 1rinton1s mgl beads. In the final operation the rolls press the parts `together as shown in Fig. 5 to 'complete the cross section.

It will be noticed that the diameter of the coil is progressively smaller from the tiret coil to the last. This is accomplished by providing guides in front of each set of rolls. These guides guide the tubing to the rolls at an angle to the ordinary path of travel of the strip to the rolls, that 1s, at an angle to al line perpendicular to the center line through the two axes of the rolls. The greater this angle to such perpendicular line the smaller will the coil become. n short, the idea is to progressively form up the cross section and coincidently reduce the stock is iirst formed` diameter of the coil.. lin this manner jthe tubing may be formed up into the proper cross section and at the saine time curved longitudinally Without in any Way Wrinkling or deforming the product;

I am describing the way this tubing is made not for the pur ose of claiming the process or describing t e details of the machine. The machine might be an automatic machine in'which the tubing passes from one set of rolls tothe other in a continuous unbroken line. On the other hand, it is possible to make the tubing by using separate sets of rolls and passing separate pieces of stock through each set of rolls se arately until the coil is reduced to the final diameter and the cross section is formed up intothe final shape. I am simply explaining in a broad way the manufacture of this tubing so that the product that l am about to claim can be reproduced by any one having only the common skill of his calling as a tube maker. f

It will be obvious the open seam tubing of this character has a variety of uses; for instance, it can be used in the straight lengths to form part of a bannister or balustrade, or for that matter, anywhere Where a hand rail "\is necessary. The coil of the open seam tubing can be cut in suitable lengths and the ends Welded together to form a ring, as shown in Fig. 6. The Welding of the ends of the open seam tubing together has a very useful function in strengthening the tubing for even with tubing made out of the material `of the lightest gauge after the ends .have been Welded together the seam cannot open up without completely distorting the materi al, for obviously the entire circumference ofthe ring has to be distorted to permit the seam edges to spread. Rings of this character can be used for a variety of pur oses; for instance, they may be used for oops, rims, and in any place where a circular tubular member is desired.

Throughout the speciication and some of the claims l have referred to the tubing as open seam tubing which it is primarily. However, I wish it understood that if any one manufactures tubing that originally has this open seam and chooses to close the seam by the addition of solder or other material or by Welding, for instance, he still cornes within, the purview of my invention. Such a one has availed himself primarly of the open seam tubing to which has been added simply an olbvious improvement, making the tublng possibly hetter adapted for some uses.,

`What claim is: y

1. A ring, comprising a longitudinally and cross-sectionally drawncoil segment of tube with a seam formed of ahuttng turned in edges and with the ends of the coil segment Secured together in end to end' registry.

2. A tube, comprising e hollow booly of circular cross-section with en outwardly -tndnally running seamwthebutting p0rtions the two ends of the segment being united by a closed-butt joint.

lfn testimony whereof I alx my signature.

HARRY W., BUNDY 

